Always read the flash chip before writing. This will allow flashrom to

skip erase of already-erased blocks and to skip write of blocks which
already have the wanted contents.

Avoid emergency messages by checking if the chip contents after a failed
write operation (erase/write) are unchanged.

Keep the emergency messages after a failed pure erase. That part is
debatable because if someone wants erase, he pretty sure doesn't care
about the flash contents anymore.

Please note that this introduces additional overhead of a full chip read
before write. This is frowned upon by people with slow programmers.
A followup patch will make this configurable.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coreboot.org>


git-svn-id: https://code.coreboot.org/svn/flashrom/trunk@1215 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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